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key.go
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key.go
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package redimo
import (
"context"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/dynamodb"
"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
)
func (c Client) DEL(key string) (deletedFields []string, err error) {
fields, err := c.listSortKeys(key)
if err != nil {
return deletedFields, err
}
for _, field := range fields {
resp, err := c.ddbClient.DeleteItem(context.TODO(), &dynamodb.DeleteItemInput{
Key: keyDef{
pk: key,
sk: field,
}.toAV(c),
ReturnValues: types.ReturnValueAllOld,
TableName: aws.String(c.tableName),
})
if err != nil {
return deletedFields, err
}
if len(resp.Attributes) > 0 {
deletedFields = append(deletedFields, field)
}
}
return
}
func (c Client) listSortKeys(key string) (sortKeys []string, err error) {
hasMoreResults := true
var lastEvaluatedKey map[string]types.AttributeValue
for hasMoreResults {
builder := newExpresionBuilder()
builder.addConditionEquality(c.partitionKey, StringValue{key})
resp, err := c.ddbClient.Query(context.TODO(), &dynamodb.QueryInput{
ConsistentRead: aws.Bool(c.consistentReads),
ExclusiveStartKey: lastEvaluatedKey,
ExpressionAttributeNames: builder.expressionAttributeNames(),
ExpressionAttributeValues: builder.expressionAttributeValues(),
KeyConditionExpression: builder.conditionExpression(),
TableName: aws.String(c.tableName),
ProjectionExpression: aws.String(c.sortKey),
Select: types.SelectSpecificAttributes,
})
if err != nil {
return sortKeys, err
}
for _, item := range resp.Items {
parsedItem := parseItem(item, c)
sortKeys = append(sortKeys, parsedItem.sk)
}
if len(resp.LastEvaluatedKey) > 0 {
lastEvaluatedKey = resp.LastEvaluatedKey
} else {
hasMoreResults = false
}
}
return
}
func (c Client) EXISTS(key string) (exists bool, err error) {
var lastEvaluatedKey map[string]types.AttributeValue
builder := newExpresionBuilder()
builder.addConditionEquality(c.partitionKey, StringValue{key})
resp, err := c.ddbClient.Query(context.TODO(), &dynamodb.QueryInput{
ConsistentRead: aws.Bool(c.consistentReads),
ExclusiveStartKey: lastEvaluatedKey,
ExpressionAttributeNames: builder.expressionAttributeNames(),
ExpressionAttributeValues: builder.expressionAttributeValues(),
KeyConditionExpression: builder.conditionExpression(),
TableName: aws.String(c.tableName),
})
if err != nil {
return exists, err
}
return len(resp.Items) > 0, nil
}
// func (c Client) KEYS(key string) (keys []string, err error) {
// hasMoreResults := true
// var lastEvaluatedKey map[string]types.AttributeValue
// for hasMoreResults {
// builder := newExpresionBuilder()
// builder.addConditionEquality(c.pk, StringValue{key})
// resp, err := c.ddbClient.Query(context.TODO(), &dynamodb.QueryInput{
// ConsistentRead: aws.Bool(c.consistentReads),
// ExclusiveStartKey: lastEvaluatedKey,
// ExpressionAttributeNames: builder.expressionAttributeNames(),
// ExpressionAttributeValues: builder.expressionAttributeValues(),
// KeyConditionExpression: builder.conditionExpression(),
// TableName: aws.String(c.table),
// ProjectionExpression: aws.String(c.sk),
// Select: types.SelectSpecificAttributes,
// })
// if err != nil {
// return keys, err
// }
// for _, item := range resp.Items {
// parsedItem := parseItem(item, c)
// keys = append(keys, parsedItem.sk)
// }
// if len(resp.LastEvaluatedKey) > 0 {
// lastEvaluatedKey = resp.LastEvaluatedKey
// } else {
// hasMoreResults = false
// }
// }
// return
// }